US4429004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-reflecting body
Assignee: DuPont de Nemours Deutschland GmbH
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Filing: 1981-06-15
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Granted: 1984-01-31
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Expires: 2001-06-15
Abstract
Abstract A light-reflecting body, in particular a car headlight, whose wall consists of a poly-(1,4-butylene terephthalate) which contains 10-60% by weight of a filler, having a particle size of at most 30 μm, chosen from the group comprising kaolin, talc, mica, wollastonite, glass beads, zinc sulfide, lithopone, calcium sulfate and barium sulfate, onto which wall is applied a light-reflecting metal layer, if necessary over a previously applied lacquer layer.
Inventors
- 👤 Franz Breitenfellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:38
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; F; F21; F21S; F21S41/00; F21S41/30; F21S41/37; F21V; F21V7/00; F21V7/22; F21V7/24; F21V7/28; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/252; Y10T428/256; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A light-reflecting body having a wall and a reflecting metal layer on at least one surface of the wall either directly or on top of the lacquer layer, said wall consisting of (a) 90-70% by weight of poly(1,4-butylene terephthalate) or a copolyester based on 1,4-butylene terephthalate, and (b) 10-30% by weight of a finely divided filler which is kaolin or mica, and wherein the filler has a particle size of not more than 30 microns.
Claim 2
Dependent Claim
75 words
A light-reflecting body having a wall and a reflecting metal layer on at least one surface of the wall either directly or on top of the lacquer layer, said wall consisting of (a) 90-70% by weight of poly(1,4-butylene terephthalate) or a copolyester based on 1,4-butylene terephthalate, and (b) 10-30% by weight of a finely divided filler which is kaolin or mica, and wherein the filler has a particle size of not more than 30 microns.
Claim 3
Dependent Claim
12 words
A body according to claim 1 wherein component (a) is poly(1,4-butylene terephthalate).
Claim 4
Dependent Claim
11 words
A body according to claim 1, wherein the filler is kaolin.
Claim 5
Dependent Claim
13 words
A body according to claim 3, which contains 20-30% by weight of kaolin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |